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Gorny J, Jardin C, Diez O, Galceran J, Gourgiotis A, Happel S, Coppin F, Février L, Simonucci C, Cazala C. Dissolved iodide in marine waters determined with Diffusive Gradients in Thin-films technique. Anal Chim Acta 2021; 1177:338790. [PMID: 34482898 DOI: 10.1016/j.aca.2021.338790] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2021] [Revised: 06/15/2021] [Accepted: 06/20/2021] [Indexed: 10/21/2022]
Abstract
For the first time, Diffusive Gradient in Thin-films (DGT) focuses on the inorganic iodine species iodate (IO3-) and iodide (I-). A silver-doped Cl resin (AgdCl), which is known to selectively accumulate I-, was used to make a binding gel. Laboratory investigations were designed to verify the suitability of the AgdCl-DGT method to measure the total I- concentration in environmental waters. Total recovery of I- was obtained using an elution solution containing 100 mmol L-1 KCN. DGT validation experiments in 10 mmol L-1 NaCl showed linear accumulation of I- over time, contrary to IO3-, thus confirming the selectivity of AgdCl-binding gel. The AgdCl-DGT measurement of total I- concentration was independent of pH (4.5-8.8) and was not impacted by the presence of bicarbonate (1-5 mmol L-1). Finally, the performance of AgdCl-DGT samplers were tested in two continental waters and a synthetic seawater. The AgdCl-DGT samplers measured 27-33% of the total I- concentration in the two continental waters up to 24 h of deployment time, whereas the AgdCl-DGT response retrieved the total I- concentration in seawater up to 72 h (106 ± 7%). The difference in DGT response was attributed to the low ionic strength of the two continental waters, limiting the application of AgdCl-DGT method to media with higher ionic strength.
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Affiliation(s)
- Josselin Gorny
- Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PSE-ENV, SEDRE, LELI, Fontenay-aux-Roses, France.
| | - Cyrielle Jardin
- Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PSE-ENV, SEDRE, LELI, Fontenay-aux-Roses, France
| | - Olivier Diez
- Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PSE-ENV, SEDRE, LELI, Fontenay-aux-Roses, France
| | - Josep Galceran
- Departament de Química, Universitat de Lleida and AGROTECNIO-CERCA, Rovira Roure 191, 25198, Lleida, Spain
| | - Alkiviadis Gourgiotis
- Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PSE-ENV, SEDRE, LELI, Fontenay-aux-Roses, France
| | | | - Fréderic Coppin
- Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PSE-ENV, SRTE, LR2T, Cadarache, France
| | - Laureline Février
- Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PSE-ENV, SRTE, LR2T, Cadarache, France
| | - Caroline Simonucci
- Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PSE-ENV, SEDRE, LELI, Fontenay-aux-Roses, France; Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PSE-ENV, SIRSE, LER-NORD, France
| | - Charlotte Cazala
- Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PSE-ENV, SEDRE, LELI, Fontenay-aux-Roses, France
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